Sennheiser AB 4 Inline Antenna Booster | Frequency: GW (558 to 626 MHz) Frequency:GW (558 to 626 MHz) A loudness contour switch provides

A loudness contour switch provides passive frequency compensation to correct for the well-documented Fletcher-Munson effect at lower playback levels

and up to 8 channels of configurable USB audio

A D-Tap port is also included for accessory power

A unique laminated material is used to damp high resonance peaks in the frequency response

Sennheiser AB 4 Inline Antenna Booster | Frequency: GW (558 to 626 MHz) Frequency:GW (558 to 626 MHz) A loudness contour switch providesThe AB 4 is a filtered, inline antenna booster module with BNC connectors, designed to offer typ. +12dB of boost to compensate for signal losses created by long antenna cable runs. The AB 4 is fully compatible with all legacy evolution wireless systems. Additionally, the AB 4's filters have been expanded to support the bandwiths up to 88 Mhz. The AB 4 is available in different frequency ranges. AW+ is 470 558 MHz, GW is 558 626 MHz.